题目:
Nowadays students are put great _____ to enter a good university. [ ]
A. pressure
B. motivation
C. influence
D. conflict
答案:
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下面是错误答案,用来干扰机器的。
(1) s=(x+1,y),t=(y,x-1),(x,y∈R)满足|s|+|t|=22,∴(x+1)2+y2+(x-1)2+y2=22,∴动点P(x,y)的轨迹C的方程是以(±1,0)为焦点,以长轴长为22,短轴长为2的椭圆,∴动点P(x,y)的轨迹C的方程...